Method of selecting accident image based on speed profile analysis

Abstract

The present disclosure relates to a method of selecting an accident image by using speed profile analysis, which can sufficiently secure an available capacity of a storage medium, can reduce the amount of transmission data and a fee therefor, and can prevent a loss of unnecessary management expenses, by selecting an actual accident image by using speed profile analysis before and after the occurrence of an impact event and deleting, from the storage medium, an image having a grade determined to have a low accident possibility or changing a state of the image into an overwritable state or taking measures for preventing the transmission of the image to a cloud server.

The invention claimed is: 
     
       1. A method of selecting an accident based on speed profile analysis, by detecting, by a blackbox installed in a vehicle, an impact applied to the vehicle, storing an image before and after impact detection timing (T 0 ) as an impact detection image, and then determining whether the impact detection image is an accident image, the method comprising steps of:
 (a) determining whether a driving speed of the vehicle maintains a reference speed (V TH ) or less for a given time in a section between first timing (T 1 ) before the impact detection timing (T 0 ) and second timing (T 2 ) after the impact detection timing (T 0 ); 
 (b) determining the impact detection image as an image having a low accident possibility when the driving speed is determined to be greater than the reference speed (V TH ) in the step (a); 
 (c) determining the impact detection image as an image having a high accident possibility when the driving speed is determined to be equal to or smaller than the reference speed (V TH ) in the step (a); 
 (d) detecting a deceleration ratio of the vehicle in the section between the first timing (T 1 ) and the second timing (T 2 ) and determining whether i) the deceleration ratio is less than a predetermined safe deceleration ratio (SDR), ii) the deceleration ratio is equal to or greater than the SDR and is equal to or smaller than an accident deceleration ratio (ADR) predetermined as a value greater than the SDR, iii) the deceleration ratio is greater than the ADR; 
 (e) re-determining the impact detection image as an image having a low accident possibility again when the determination result of the step (d) indicates that i) the deceleration ratio is less than the SDR or ii) the deceleration ratio is equal to or greater than the SDR and is equal to or smaller than the ADR; and 
 (f) determining the impact detection image as an accident image when the determination result of the step (d) indicates that iii) the deceleration ratio is greater than the ADR; 
 (g) selecting a sudden deceleration section, in which the vehicle is decelerated most suddenly, among a plurality of division sections obtained by equally dividing the section between the first timing (T 1 ) and the second timing (T 2 ), and determining whether the sudden deceleration section is located i) before the impact detection timing (T 0 ), ii) before and after the impact detection timing (T 0 ) while overlapping the impact detection timing (T 0 ), or iii) after the impact detection timing (T 0 ); 
 (h) determining the impact detection image as a first-grade accident image indicative of the highest accident possibility when the determination result of the step (g) indicates that the sudden deceleration section is located i) before the impact detection timing (T 0 ); 
 (i) determining the impact detection image as a second-grade accident image indicative of a lower accident possibility than the first-grade accident image when the determination result of the step (g) indicates that the sudden deceleration section is located ii) before and after the impact detection timing (T 0 ) while overlapping the impact detection timing (T 0 ); and 
 (j) determining the impact detection image as a third-grade accident image indicative of a lower accident possibility than the second-grade accident image when the determination result of the step (g) indicates that the sudden deceleration section is located iii) after the impact detection timing (T 0 ); 
 wherein when determining the impact detection image as the first-grade accident image, the second-grade accident image, or the third-grade accident image, tag information of a corresponding accident grade image is included in the impact detection image, and the impact detection image including the tag information is preserved in a storage medium within the blackbox or moved to a region incapable of being overwritten. 
 
     
     
       2. The method of  claim 1 , wherein in the step (a), the reference speed (V TH ) is set in a range of 0 (zero) to 5 km/h. 
     
     
       3. The method of  claim 1 , wherein when the impact detection image is determined as an image having a low accident possibility in the step (b), the impact detection image is deleted from the storage medium of the blackbox or moved to an overwritable region. 
     
     
       4. The method of  claim 1 , wherein when determining the impact detection image as the first-grade accident image, the second-grade accident image, or the third-grade accident image, the impact detection image is immediately transmitted to a remote control server. 
     
     
       5. The method of  claim 1 , wherein when the determination result of the step (d) indicates that ii) the deceleration ratio is equal to or greater than the SDR and is equal to or smaller than the ADR, the impact detection image is determined as a fourth-grade accident image indicative of a lower accident possibility than the third-grade accident image, and is temporarily preserved in a storage medium within the blackbox or moved to an overwritable region. 
     
     
       6. The method of  claim 5 , wherein when determining the impact detection image as the fourth-grade accident image, the fourth-grade accident image is transmitted to a remote control server when the remote control server requests the transmission of the fourth-grade accident image. 
     
     
       7. The method of  claim 5 , wherein when the determination result of the step (d) indicates that i) the deceleration ratio is less than the SDR, the impact detection image is determined as a fifth-grade accident image indicative of a lower accident possibility than the fourth-grade accident image, and is deleted from the storage medium or moved to an overwritable region. 
     
     
       8. The method of  claim 7 , wherein when the impact detection image is determined as an image having a low accident possibility in the step (b), the impact detection image is determined as a sixth-grade accident image indicative of a lower accident possibility than the fifth-grade accident image.